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Max Jonasson

Connecting the systems that power commerce

I build reliable data bridges between POS, ERP, payment, and e-commerce platforms. Currently at Heads, designing integrations and implementation flows for Scandinavia's largest retailers.

Based in Stockholm, SE
Working at Heads
Focus Systems Integration
Some of the companies I've worked for
Heads Northmill Bank Yabie

Five years connecting commerce systems.

Sep 2024 โ€” Present
Technical Solutions & Implementation ยท Full-time ยท Stockholm
Designing and implementing integration flows between Heads' commerce platform and enterprise retail systems. I map data flows between POS, ERP, order management, and payment services โ€” handling API configuration, webhook routing, and troubleshooting data sync issues across multi-store environments. Responsible for technical onboarding of new enterprise clients, ensuring their existing systems connect cleanly to our REST APIs.
REST APIsWebhooksERP IntegrationPOS โ†” E-commerceJSON
Apr โ€” Sep 2024
MJ Kassasystem
Founder & Technical Director
Built a POS reselling business from scratch โ€” sourcing, configuring, and deploying point-of-sale systems with payment terminal integrations. Handled end-to-end setup including fiscal compliance (Swedish tax authority integration), payment acquiring connections, and hardware-to-software configuration. Reached 700k SEK revenue before joining Heads.
POS โ†” PaymentFiscal APIsHardware ConfigEnd-to-end Deployment
Mar 2023 โ€” Apr 2024
Customer Success ยท Full-time
Configured merchant accounts and integrated payment terminals with Northmill's acquiring platform. Managed the technical pipeline from terminal provisioning through payment gateway connection to transaction reconciliation. Handled B2B billing flows and debugged integration failures between POS hardware and the bank's processing APIs.
Payment GatewayTerminal โ†” AcquiringB2B BillingTransaction Reconciliation
Sep 2020 โ€” Mar 2023
Onboarding Specialist โ†’ Enterprise Onboarding & 2nd-line Support
Owned enterprise integration and deployment for accounts including IKEA and AXS. Managed device fleet provisioning via Apple Business Manager (MDM), configured POS-to-backend data flows, and acted as the technical bridge between enterprise clients and engineering โ€” translating integration requirements into actionable specs. Deployed and maintained hundreds of iPads across multi-location retail environments.
MDM / Fleet MgmtEnterprise OnboardingPOS โ†” Backend2nd-line Debugging
May โ€” Sep 2020
PC Kassasystem
Technical Solutions & Implementation ยท Acquired by Yabie
Built PowerShell automation for log collection, backup verification, and system health monitoring across distributed POS environments. Diagnosed integration failures between POS software, SQL databases, and peripheral hardware via remote sessions. Developed repeatable troubleshooting procedures that reduced escalation time. Company acquired by Yabie.
PowerShellSQL DebuggingRemote DiagnosticsAutomation

How I connect systems. Hover to explore.

Protocols & Architecture Platforms Scripting & Data Infrastructure

I like to tinker.

max-jonasson
Integration experiments, API prototypes, and automation scripts

When I want to understand a new API or test an integration pattern, I build a quick prototype. Webhook listeners, data mapping scripts, sync tools โ€” most of it is rough, but that's how I learn what works before bringing it to production.

Have a look

Need systems that talk to each other?

If you're working on integrations, data orchestration, or connecting commerce platforms, I'd like to hear about it.

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